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authorworktycho <work.tycho@gmail.com>2013-12-09 18:51:12 +0100
committerworktycho <work.tycho@gmail.com>2013-12-09 18:51:12 +0100
commit843605d59ebc128be0a578dc6f45ef8c05da6e79 (patch)
tree3ffebc6ba27baf7a9e1d4bc51501ffeea9b14226 /src/Simulator/FloodyFluidSimulator.cpp
parentmerged makefile changes (diff)
parentFix Undefined behavior at Bindings/LuaWindow line 32 (diff)
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diff --git a/src/Simulator/FloodyFluidSimulator.cpp b/src/Simulator/FloodyFluidSimulator.cpp
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+
+// FloodyFluidSimulator.cpp
+
+// Interfaces to the cFloodyFluidSimulator that represents a fluid simulator that tries to flood everything :)
+// http://forum.mc-server.org/showthread.php?tid=565
+
+#include "Globals.h"
+
+#include "FloodyFluidSimulator.h"
+#include "../World.h"
+#include "../Chunk.h"
+#include "../BlockArea.h"
+#include "../Blocks/BlockHandler.h"
+
+
+
+
+
+// Enable or disable detailed logging
+#if 0
+ #define FLOG LOGD
+#else
+ #define FLOG(...)
+#endif
+
+
+
+
+
+cFloodyFluidSimulator::cFloodyFluidSimulator(
+ cWorld & a_World,
+ BLOCKTYPE a_Fluid,
+ BLOCKTYPE a_StationaryFluid,
+ NIBBLETYPE a_Falloff,
+ int a_TickDelay,
+ int a_NumNeighborsForSource
+) :
+ super(a_World, a_Fluid, a_StationaryFluid, a_TickDelay),
+ m_Falloff(a_Falloff),
+ m_NumNeighborsForSource(a_NumNeighborsForSource)
+{
+}
+
+
+
+
+
+void cFloodyFluidSimulator::SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+ FLOG("Simulating block {%d, %d, %d}: block %d, meta %d",
+ a_Chunk->GetPosX() * cChunkDef::Width + a_RelX, a_RelY, a_Chunk->GetPosZ() * cChunkDef::Width + a_RelZ,
+ a_Chunk->GetBlock(a_RelX, a_RelY, a_RelZ),
+ a_Chunk->GetMeta(a_RelX, a_RelY, a_RelZ)
+ );
+
+ NIBBLETYPE MyMeta = a_Chunk->GetMeta(a_RelX, a_RelY, a_RelZ);
+ if (!IsAnyFluidBlock(a_Chunk->GetBlock(a_RelX, a_RelY, a_RelZ)))
+ {
+ // Can happen - if a block is scheduled for simulating and gets replaced in the meantime.
+ FLOG(" BadBlockType exit");
+ return;
+ }
+
+ if (MyMeta != 0)
+ {
+ // Source blocks aren't checked for tributaries, others are.
+ if (CheckTributaries(a_Chunk, a_RelX, a_RelY, a_RelZ, MyMeta))
+ {
+ // Has no tributary, has been decreased (in CheckTributaries()),
+ // no more processing needed (neighbors have been scheduled by the decrease)
+ FLOG(" CheckTributaries exit");
+ return;
+ }
+ }
+
+ // New meta for the spreading to neighbors:
+ // If this is a source block or was falling, the new meta is just the falloff
+ // Otherwise it is the current meta plus falloff (may be larger than max height, will be checked later)
+ NIBBLETYPE NewMeta = ((MyMeta == 0) || ((MyMeta & 0x08) != 0)) ? m_Falloff : (MyMeta + m_Falloff);
+ bool SpreadFurther = true;
+ if (a_RelY > 0)
+ {
+ BLOCKTYPE Below = a_Chunk->GetBlock(a_RelX, a_RelY - 1, a_RelZ);
+ if (IsPassableForFluid(Below) || IsBlockLava(Below) || IsBlockWater(Below))
+ {
+ // Spread only down, possibly washing away what's there or turning lava to stone / cobble / obsidian:
+ SpreadToNeighbor(a_Chunk, a_RelX, a_RelY - 1, a_RelZ, 8);
+ SpreadFurther = false;
+ }
+ // If source creation is on, check for it here:
+ else if (
+ (m_NumNeighborsForSource > 0) && // Source creation is on
+ (MyMeta == m_Falloff) && // Only exactly one block away from a source (fast bail-out)
+ !IsPassableForFluid(Below) && // Only exactly 1 block deep
+ CheckNeighborsForSource(a_Chunk, a_RelX, a_RelY, a_RelZ) // Did we create a source?
+ )
+ {
+ // We created a source, no more spreading is to be done now
+ // Also has been re-scheduled for ticking in the next wave, so no marking is needed
+ return;
+ }
+ }
+
+ if (SpreadFurther && (NewMeta < 8))
+ {
+ // Spread to the neighbors:
+ SpreadToNeighbor(a_Chunk, a_RelX - 1, a_RelY, a_RelZ, NewMeta);
+ SpreadToNeighbor(a_Chunk, a_RelX + 1, a_RelY, a_RelZ, NewMeta);
+ SpreadToNeighbor(a_Chunk, a_RelX, a_RelY, a_RelZ - 1, NewMeta);
+ SpreadToNeighbor(a_Chunk, a_RelX, a_RelY, a_RelZ + 1, NewMeta);
+ }
+
+ // Mark as processed:
+ a_Chunk->FastSetBlock(a_RelX, a_RelY, a_RelZ, m_StationaryFluidBlock, MyMeta);
+}
+
+
+
+
+
+bool cFloodyFluidSimulator::CheckTributaries(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_MyMeta)
+{
+ // If we have a section above, check if there's fluid above this block that would feed it:
+ if (a_RelY < cChunkDef::Height - 1)
+ {
+ if (IsAnyFluidBlock(a_Chunk->GetBlock(a_RelX, a_RelY + 1, a_RelZ)))
+ {
+ // This block is fed from above, no more processing needed
+ FLOG(" Fed from above");
+ return false;
+ }
+ }
+
+ // Not fed from above, check if there's a feed from the side (but not if it's a downward-flowing block):
+ if (a_MyMeta != 8)
+ {
+ BLOCKTYPE BlockType;
+ NIBBLETYPE BlockMeta;
+ static const Vector3i Coords[] =
+ {
+ Vector3i( 1, 0, 0),
+ Vector3i(-1, 0, 0),
+ Vector3i( 0, 0, 1),
+ Vector3i( 0, 0, -1),
+ } ;
+ for (int i = 0; i < ARRAYCOUNT(Coords); i++)
+ {
+ if (!a_Chunk->UnboundedRelGetBlock(a_RelX + Coords[i].x, a_RelY, a_RelZ + Coords[i].z, BlockType, BlockMeta))
+ {
+ continue;
+ }
+ if (IsAllowedBlock(BlockType) && IsHigherMeta(BlockMeta, a_MyMeta))
+ {
+ // This block is fed, no more processing needed
+ FLOG(" Fed from {%d, %d, %d}, type %d, meta %d",
+ a_Chunk->GetPosX() * cChunkDef::Width + a_RelX + Coords[i].x,
+ a_RelY,
+ a_Chunk->GetPosZ() * cChunkDef::Width + a_RelZ + Coords[i].z,
+ BlockType, BlockMeta
+ );
+ return false;
+ }
+ } // for i - Coords[]
+ } // if not fed from above
+
+ // Block is not fed, decrease by m_Falloff levels:
+ if (a_MyMeta >= 8)
+ {
+ FLOG(" Not fed and downwards, turning into non-downwards meta %d", m_Falloff);
+ a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, m_StationaryFluidBlock, m_Falloff);
+ }
+ else
+ {
+ a_MyMeta += m_Falloff;
+ if (a_MyMeta < 8)
+ {
+ FLOG(" Not fed, decreasing from %d to %d", a_MyMeta - m_Falloff, a_MyMeta);
+ a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, m_StationaryFluidBlock, a_MyMeta);
+ }
+ else
+ {
+ FLOG(" Not fed, meta %d, erasing altogether", a_MyMeta);
+ a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_AIR, 0);
+ }
+ }
+ return true;
+}
+
+
+
+
+
+void cFloodyFluidSimulator::SpreadToNeighbor(cChunk * a_NearChunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta)
+{
+ ASSERT(a_NewMeta <= 8); // Invalid meta values
+ ASSERT(a_NewMeta > 0); // Source blocks aren't spread
+
+ BLOCKTYPE BlockType;
+ NIBBLETYPE BlockMeta;
+ if (!a_NearChunk->UnboundedRelGetBlock(a_RelX, a_RelY, a_RelZ, BlockType, BlockMeta))
+ {
+ // Chunk not available
+ return;
+ }
+
+ if (IsAllowedBlock(BlockType))
+ {
+ if ((BlockMeta == a_NewMeta) || IsHigherMeta(BlockMeta, a_NewMeta))
+ {
+ // Don't spread there, there's already a higher or same level there
+ return;
+ }
+ }
+
+ // Check water - lava interaction:
+ if (m_FluidBlock == E_BLOCK_LAVA)
+ {
+ if (IsBlockWater(BlockType))
+ {
+ // Lava flowing into water, change to stone / cobblestone based on direction:
+ BLOCKTYPE NewBlock = (a_NewMeta == 8) ? E_BLOCK_STONE : E_BLOCK_COBBLESTONE;
+ FLOG(" Lava flowing into water, turning water at rel {%d, %d, %d} into stone",
+ a_RelX, a_RelY, a_RelZ,
+ ItemTypeToString(NewBlock).c_str()
+ );
+ a_NearChunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, NewBlock, 0);
+ m_World.BroadcastSoundEffect("random.fizz", a_RelX * 8, a_RelY * 8, a_RelZ * 8, 0.5f, 1.5f);
+ return;
+ }
+ }
+ else if (m_FluidBlock == E_BLOCK_WATER)
+ {
+ if (IsBlockLava(BlockType))
+ {
+ // Water flowing into lava, change to cobblestone / obsidian based on dest block:
+ BLOCKTYPE NewBlock = (BlockMeta == 0) ? E_BLOCK_OBSIDIAN : E_BLOCK_COBBLESTONE;
+ FLOG(" Water flowing into lava, turning lava at rel {%d, %d, %d} into %s",
+ a_RelX, a_RelY, a_RelZ, ItemTypeToString(NewBlock).c_str()
+ );
+ a_NearChunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, NewBlock, 0);
+ m_World.BroadcastSoundEffect("random.fizz", a_RelX * 8, a_RelY * 8, a_RelZ * 8, 0.5f, 1.5f);
+ return;
+ }
+ }
+ else
+ {
+ ASSERT(!"Unknown fluid!");
+ }
+
+ if (!IsPassableForFluid(BlockType))
+ {
+ // Can't spread there
+ return;
+ }
+
+ // Wash away the block there, if possible:
+ if (CanWashAway(BlockType))
+ {
+ cBlockHandler * Handler = BlockHandler(BlockType);
+ if (Handler->DoesDropOnUnsuitable())
+ {
+ Handler->DropBlock(
+ &m_World, NULL,
+ a_NearChunk->GetPosX() * cChunkDef::Width + a_RelX,
+ a_RelY,
+ a_NearChunk->GetPosZ() * cChunkDef::Width + a_RelZ
+ );
+ }
+ } // if (CanWashAway)
+
+ // Spread:
+ FLOG(" Spreading to {%d, %d, %d} with meta %d",
+ a_NearChunk->GetPosX() * cChunkDef::Width + a_RelX,
+ a_RelY,
+ a_NearChunk->GetPosZ() * cChunkDef::Width + a_RelZ,
+ a_NewMeta
+ );
+ a_NearChunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, m_FluidBlock, a_NewMeta);
+}
+
+
+
+
+
+bool cFloodyFluidSimulator::CheckNeighborsForSource(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+ FLOG(" Checking neighbors for source creation");
+
+ static const Vector3i NeighborCoords[] =
+ {
+ Vector3i(-1, 0, 0),
+ Vector3i( 1, 0, 0),
+ Vector3i( 0, 0, -1),
+ Vector3i( 0, 0, 1),
+ } ;
+
+ int NumNeeded = m_NumNeighborsForSource;
+ for (int i = 0; i < ARRAYCOUNT(NeighborCoords); i++)
+ {
+ int x = a_RelX + NeighborCoords[i].x;
+ int y = a_RelY + NeighborCoords[i].y;
+ int z = a_RelZ + NeighborCoords[i].z;
+ BLOCKTYPE BlockType;
+ NIBBLETYPE BlockMeta;
+ if (!a_Chunk->UnboundedRelGetBlock(x, y, z, BlockType, BlockMeta))
+ {
+ // Neighbor not available, skip it
+ continue;
+ }
+ // FLOG(" Neighbor at {%d, %d, %d}: %s", x, y, z, ItemToFullString(cItem(BlockType, 1, BlockMeta)).c_str());
+ if ((BlockMeta == 0) && IsAnyFluidBlock(BlockType))
+ {
+ NumNeeded--;
+ // FLOG(" Found a neighbor source at {%d, %d, %d}, NumNeeded := %d", x, y, z, NumNeeded);
+ if (NumNeeded == 0)
+ {
+ // Found enough, turn into a source and bail out
+ // FLOG(" Found enough neighbor sources, turning into a source");
+ a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, m_FluidBlock, 0);
+ return true;
+ }
+ }
+ }
+ // FLOG(" Not enough neighbors for turning into a source, NumNeeded = %d", NumNeeded);
+ return false;
+}
+
+
+
+